package com.yunshangwoniu.core.utils;

import java.security.MessageDigest;

public class MD5Utils
{
	// MD5加码。32位
		public static String MD5(String inStr)
		{
			MessageDigest md5 = null;
			try
			{
				md5 = MessageDigest.getInstance("MD5");
			} catch (Exception e)
			{
				System.out.println(e.toString());
				e.printStackTrace();
				return "";
			}
			char[] charArray = inStr.toCharArray();
			byte[] byteArray = new byte[charArray.length];

			for (int i = 0; i < charArray.length; i++)
				byteArray[i] = (byte) charArray[i];
			byte[] md5Bytes = md5.digest(byteArray);
			StringBuffer hexValue = new StringBuffer();
			for (int i = 0; i < md5Bytes.length; i++)
			{
				int val = ((int) md5Bytes[i]) & 0xff;
				if (val < 16)
					hexValue.append("0");
				hexValue.append(Integer.toHexString(val));
			}
			return hexValue.toString();
		}
		// 可逆的加密算法
		public static String KL(String inStr)
		{
			char[] a = inStr.toCharArray();
			for (int i = 0; i < a.length; i++)
			{
				a[i] = (char) (a[i] ^ 't');
			}
			String s = new String(a);
			return s;
		}
		// 加密后解密
		public static String JM(String inStr)
		{
			char[] a = inStr.toCharArray();
			for (int i = 0; i < a.length; i++)
			{
				a[i] = (char) (a[i] ^ 't');
			}
			String k = new String(a);
			return k;
		}
		public static String MD5JM(String needMD5Str)
		{
			return KL(MD5(needMD5Str));
		}

		// 测试主函数
		public static void main(String args[])
		{
			String s = new String("a");
			System.out.println("原始：" + s);
			System.out.println("MD5后：" + MD5(s));
			System.out.println("MD5后再加密：" + KL(MD5(s)));
			System.out.println("解密为MD5后的：" + JM(KL(MD5(s))));
		}
}
